Security Best Practices

Most security incidents in Python applications are not exotic exploits. They are mundane mistakes that compound: a query built with string concatenation, a pickle.loads on user input, a random.randint used for a password reset token, a secret committed to git. The fixes are usually one line. The hard part is knowing which line. This lesson covers the security pitfalls that show up most often in Python code, the standard-library and ecosystem tools that prevent them, and how to map common Python mistakes to the OWASP categories that describe them.